#sky {
  width: 400px;
  height: 400px;
  border: solid 1px #ff0000;
  box-shadow: 5px 10px 30px #ff0000;
}
#sky1 {
  width: 400px;
  height: 400px;
  border: solid 1px #000000;
  box-shadow: 0px 50px 30px #000000;
}
#sky2 {
  width: 400px;
  height: 400px;
  border: solid 1px #000000;
  box-shadow: 10px 50px 30px #000000;
}
